PostgreSQL " opis tabeli"
Jak wykonać odpowiednik DESCRIBE TABLE
Oracle w PostgreSQL (używając polecenia psql)?
18 answers
Spróbuj tego (w narzędziu wiersza poleceń psql
):
\d+ tablename
Zobacz Instrukcja aby uzyskać więcej informacji.
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2015-02-26 11:55:36
Oprócz sposobu PostgreSQL (\d 'something' lub \dt 'table' lub \DS 'sequence' i tak dalej)
Standardowy sposób SQL, jak pokazano tutaj :
select column_name, data_type, character_maximum_length
from INFORMATION_SCHEMA.COLUMNS where table_name = '<name of table>';
Jest obsługiwany przez wiele silników db.Warning: date(): Invalid date.timezone value 'Europe/Kyiv', we selected the timezone 'UTC' for now. in /var/www/agent_stack/data/www/doraprojects.net/template/agent.layouts/content.php on line 54
2017-05-23 12:10:54
Jeśli chcesz uzyskać go z query zamiast psql, możesz odpytywać schemat katalogu. Oto złożone zapytanie, które to robi:
SELECT
f.attnum AS number,
f.attname AS name,
f.attnum,
f.attnotnull AS notnull,
pg_catalog.format_type(f.atttypid,f.atttypmod) AS type,
CASE
WHEN p.contype = 'p' THEN 't'
ELSE 'f'
END AS primarykey,
CASE
WHEN p.contype = 'u' THEN 't'
ELSE 'f'
END AS uniquekey,
CASE
WHEN p.contype = 'f' THEN g.relname
END AS foreignkey,
CASE
WHEN p.contype = 'f' THEN p.confkey
END AS foreignkey_fieldnum,
CASE
WHEN p.contype = 'f' THEN g.relname
END AS foreignkey,
CASE
WHEN p.contype = 'f' THEN p.conkey
END AS foreignkey_connnum,
CASE
WHEN f.atthasdef = 't' THEN d.adsrc
END AS default
FROM pg_attribute f
JOIN pg_class c ON c.oid = f.attrelid
JOIN pg_type t ON t.oid = f.atttypid
LEFT JOIN pg_attrdef d ON d.adrelid = c.oid AND d.adnum = f.attnum
LEFT JOIN pg_namespace n ON n.oid = c.relnamespace
LEFT JOIN pg_constraint p ON p.conrelid = c.oid AND f.attnum = ANY (p.conkey)
LEFT JOIN pg_class AS g ON p.confrelid = g.oid
WHERE c.relkind = 'r'::char
AND n.nspname = '%s' -- Replace with Schema name
AND c.relname = '%s' -- Replace with table name
AND f.attnum > 0 ORDER BY number
;
Jest dość skomplikowany, ale pokazuje moc i elastyczność katalogu systemu PostgreSQL i powinien ci pomóc w drodze do mistrzostwa pg_catalog ;-). Pamiętaj, aby zmienić %s W zapytaniu. Pierwszy to schemat, a drugi to nazwa tabeli.
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2012-10-22 09:38:18
Możesz to zrobić za pomocą polecenia ukośnika psql:
\d myTable describe table
Działa również dla innych obiektów:
\d myView describe view
\d myIndex describe index
\d mySequence describe sequence
Źródło: faqs.org
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2015-09-22 19:18:33
Odpowiednikiem psql DESCRIBE TABLE
jest \d table
.
Zobacz część psql podręcznika PostgreSQL po więcej szczegółów.
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2014-03-05 20:49:33
Możesz zrobić \d *search pattern *
z gwiazdkami , aby znaleźć tabele pasujące do wzorca wyszukiwania, który Cię interesuje.
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2014-06-05 14:07:30
Oprócz wiersza poleceń \d+ <table_name>
, który już znalazłeś, możesz również użyć information-schema, Aby wyszukać dane kolumny, używając info_schema.Kolumny
SELECT *
FROM info_schema.columns
WHERE table_schema = 'your_schema'
AND table_name = 'your_table'
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2016-04-17 19:57:09
Możesz użyć tego:
SELECT attname
FROM pg_attribute,pg_class
WHERE attrelid=pg_class.oid
AND relname='TableName'
AND attstattarget <>0;
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2017-08-28 21:10:25
Użyj następującego polecenia SQL
SELECT DATA_TYPE
FROM INFORMATION_SCHEMA.COLUMNS
WHERE table_name = 'tbl_name'
AND COLUMN_NAME = 'col_name'
Jeśli zastąpisz tbl_name i col_name, wyświetli typ danych konkretnego coloumn, którego szukasz.
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2017-08-28 17:41:24
Ta odmiana zapytania (jak wyjaśniono w innych odpowiedziach) zadziałała dla mnie.
SELECT
COLUMN_NAME
FROM
information_schema.COLUMNS
WHERE
TABLE_NAME = 'city';
Jest tu opisane szczegółowo: http://www.postgresqltutorial.com/postgresql-describe-table/
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2018-02-14 13:46:49
Najlepszy sposób na opisanie tabeli, takiej jak kolumna, Typ, modyfikatory kolumn itp.
\d+ tablename or \d tablename
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2017-08-06 15:25:06
W MySQL , opisz table_name
In PostgreSQL , \D table_name
Lub możesz użyć tego długiego polecenia:
SELECT
a.attname AS Field,
t.typname || '(' || a.atttypmod || ')' AS Type,
CASE WHEN a.attnotnull = 't' THEN 'YES' ELSE 'NO' END AS Null,
CASE WHEN r.contype = 'p' THEN 'PRI' ELSE '' END AS Key,
(SELECT substring(pg_catalog.pg_get_expr(d.adbin, d.adrelid), '\'(.*)\'')
FROM
pg_catalog.pg_attrdef d
WHERE
d.adrelid = a.attrelid
AND d.adnum = a.attnum
AND a.atthasdef) AS Default,
'' as Extras
FROM
pg_class c
JOIN pg_attribute a ON a.attrelid = c.oid
JOIN pg_type t ON a.atttypid = t.oid
LEFT JOIN pg_catalog.pg_constraint r ON c.oid = r.conrelid
AND r.conname = a.attname
WHERE
c.relname = 'tablename'
AND a.attnum > 0
ORDER BY a.attnum
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2018-04-10 08:53:41
Możesz również sprawdzić za pomocą poniższego zapytania
Select * from schema_name.table_name limit 0;
Expmple: Moja tabela ma 2 kolumny name I pwd. Podając zrzut ekranu poniżej.
*Using PG admin3
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2016-12-12 14:51:12
Use this command
\d table name
like
\d queuerecords
Table "public.queuerecords"
Column | Type | Modifiers
-----------+-----------------------------+-----------
id | uuid | not null
endtime | timestamp without time zone |
payload | text |
queueid | text |
starttime | timestamp without time zone |
status | text |
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2017-07-20 13:22:39
/ dt jest komunikatem, który wyświetla listę wszystkich tabel obecnych w bazie danych. using
polecenie /d I / d+ możemy uzyskać szczegóły tabeli. Sysntax będzie jak
* / d table_name (or) \d+ table_name
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2017-08-09 06:03:09
In postgres \d is used to describe the table structure.
e.g. \d schema_name.table_name;
this command will provide you the basic info of table such as, columns, type and modifiers.
If you want more info about table use
\d+ schema_name.table_name;
this will give you extra info such as, storage, stats target and description
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2018-06-18 09:14:42
Aby poprawić na zapytanie SQL drugiej odpowiedzi (co jest świetne!), tu jest poprawione zapytanie. Zawiera również nazwy ograniczeń, informacje o dziedziczeniu i typy danych podzielone na części składowe (typ, Długość, precyzja, skala). Filtruje również kolumny, które zostały upuszczone (które nadal istnieją w bazie danych).
SELECT
n.nspname as schema,
c.relname as table,
f.attname as column,
f.attnum as column_id,
f.attnotnull as not_null,
f.attislocal not_inherited,
f.attinhcount inheritance_count,
pg_catalog.format_type(f.atttypid,f.atttypmod) AS data_type_full,
t.typname AS data_type_name,
CASE
WHEN f.atttypmod >= 0 AND t.typname <> 'numeric'THEN (f.atttypmod - 4) --first 4 bytes are for storing actual length of data
END AS data_type_length,
CASE
WHEN t.typname = 'numeric' THEN (((f.atttypmod - 4) >> 16) & 65535)
END AS numeric_precision,
CASE
WHEN t.typname = 'numeric' THEN ((f.atttypmod - 4)& 65535 )
END AS numeric_scale,
CASE
WHEN p.contype = 'p' THEN 't'
ELSE 'f'
END AS is_primary_key,
CASE
WHEN p.contype = 'p' THEN p.conname
END AS primary_key_name,
CASE
WHEN p.contype = 'u' THEN 't'
ELSE 'f'
END AS is_unique_key,
CASE
WHEN p.contype = 'u' THEN p.conname
END AS unique_key_name,
CASE
WHEN p.contype = 'f' THEN 't'
ELSE 'f'
END AS is_foreign_key,
CASE
WHEN p.contype = 'f' THEN p.conname
END AS foreignkey_name,
CASE
WHEN p.contype = 'f' THEN p.confkey
END AS foreign_key_columnid,
CASE
WHEN p.contype = 'f' THEN g.relname
END AS foreign_key_table,
CASE
WHEN p.contype = 'f' THEN p.conkey
END AS foreign_key_local_column_id,
CASE
WHEN f.atthasdef = 't' THEN d.adsrc
END AS default_value
FROM pg_attribute f
JOIN pg_class c ON c.oid = f.attrelid
JOIN pg_type t ON t.oid = f.atttypid
LEFT JOIN pg_attrdef d ON d.adrelid = c.oid AND d.adnum = f.attnum
LEFT JOIN pg_namespace n ON n.oid = c.relnamespace
LEFT JOIN pg_constraint p ON p.conrelid = c.oid AND f.attnum = ANY (p.conkey)
LEFT JOIN pg_class AS g ON p.confrelid = g.oid
WHERE c.relkind = 'r'::char
AND f.attisdropped = false
AND n.nspname = '%s' -- Replace with Schema name
AND c.relname = '%s' -- Replace with table name
AND f.attnum > 0
ORDER BY f.attnum
;
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2018-10-02 18:56:48
Opracowałem następujący skrypt dla schematu tabeli get.
'CREATE TABLE ' || 'yourschema.yourtable' || E'\n(\n' ||
array_to_string(
array_agg(
' ' || column_expr
)
, E',\n'
) || E'\n);\n'
from
(
SELECT ' ' || column_name || ' ' || data_type ||
coalesce('(' || character_maximum_length || ')', '') ||
case when is_nullable = 'YES' then ' NULL' else ' NOT NULL' end as column_expr
FROM information_schema.columns
WHERE table_schema || '.' || table_name = 'yourschema.yourtable'
ORDER BY ordinal_position
) column_list;
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2018-03-23 00:02:44